Power supply circuit and power distribution method thereof

Abstract

A power supply circuit and a power distribution method thereof are provided. The power supply circuit includes a power input switch block, a power supply measurement block, a power supply conversion block and a power supply control block. The power input switch block provides a first power supply voltage to a load circuit based on an external power supply voltage from an adapter. The power supply measurement block measures a current of the first power supply voltage. The power supply conversion block is coupled to the battery module to provide a second power supply voltage to the load circuit. When a battery temperature of the battery module is higher than a critical temperature and a battery power of the battery module is higher than or equal to a critical power, the power supply control block limits the second power supply voltage provided to the load circuit.

What is claimed is: 
     
       1. A power supply circuit adapted to be coupled to an adapter, a battery module, and a load circuit, comprising:
 a power supply line coupled to the load circuit; 
 a power input switch block coupled to the adapter and the power supply line, wherein the power input switch block receives an external power supply voltage from the adapter to provide a first power supply voltage, the first power supply voltage is provided to the load circuit through the power supply line; 
 a power supply control block coupled to the battery module, wherein the power supply control block is configured to measure a battery temperature and a battery power of the battery module, in response to the battery temperature of the battery module being higher than a critical temperature and the battery power of the battery module being higher than or equal to a critical power, the power supply control block provides a conversion control signal; 
 a power supply conversion block coupled to the power supply control block, the battery module, and the power supply line and receiving the conversion control signal, wherein the power supply conversion block controls the battery module to provide a second power supply voltage in response to the conversion control signal, and the second power supply voltage is provided to the load circuit through the power supply line; and 
 a power supply measurement block, wherein the power supply measurement block is coupled to the power input switch block, the load circuit, and the power supply control block, the power supply measurement block is configured to measure a current of the first power supply voltage to provide a power supply indication signal, and the power supply control block controls a power of the second power supply voltage based on the power supply indication signal, 
 wherein, in response to the battery temperature of the battery module being lower than the critical temperature and the battery power of the battery module being less than the critical power, the current of the first power supply voltage is deemed a system total current corresponding to a load state of the load circuit by the power supply control block. 
 
     
     
       2. The power supply circuit according to  claim 1 , wherein the critical power is 100% of the battery power of the battery module. 
     
     
       3. The power supply circuit according to  claim 1 , wherein the second power supply voltage is greater than or equal to the first power supply voltage. 
     
     
       4. The power supply circuit according to  claim 1 , further comprising:
 a charging switch block coupled to the battery module and the power supply line, wherein the charging switch block is activated to charge the battery module by using the first power supply voltage; and 
 a discharging switch block coupled to the battery module and the power supply line, wherein the discharging switch block is activated to convert a battery voltage of the battery module into a third power supply voltage, wherein the third power supply voltage is provided to the power supply line. 
 
     
     
       5. The power supply circuit according to  claim 1 , wherein, in response to the power supply control block providing the conversion control signal, a supply time of the conversion control signal is determined based on a system total current required for the load state of the load circuit and a present current of the first power supply voltage. 
     
     
       6. The power supply circuit according to  claim 5 , wherein the power supply control block determines a current of the second power supply voltage based on the system total current and the present current of the first power supply voltage, and a discharging time of the battery module discharging power from the critical power to a security power is calculated as the supply time according to the current of the second power supply voltage. 
     
     
       7. The power supply circuit according to  claim 6 , wherein the security power is less than the critical power. 
     
     
       8. The power supply circuit according to  claim 5 , wherein, during the supply time, in response to the battery temperature being lower than the critical temperature, the power supply control block stops providing the conversion control signal. 
     
     
       9. A power distribution method of a power supply circuit, comprising:
 based on that a power supply circuit is connected to an adapter, measuring a battery power of a battery module through a power supply control block of the power supply circuit; 
 based on that the battery power of the battery module is higher than or equal to a critical power, measuring a battery temperature of the battery module through the power supply control block; 
 based on that the battery temperature of the battery module is higher than a critical temperature, converting a battery voltage of the battery module into a power supply voltage through a power supply conversion block, wherein the power supply voltage is provided to a load circuit; and 
 based on that the battery temperature is lower than the critical temperature, a current of an external power supply voltage of the adapter being deemed a system total current corresponding to a load state of the load circuit. 
 
     
     
       10. The power distribution method according to  claim 9 , wherein the critical power is 100% of the battery power of the battery module. 
     
     
       11. The power distribution method according to  claim 9 , wherein the power supply voltage is greater than or equal to an external power supply voltage of the adapter. 
     
     
       12. The power distribution method according to  claim 9 , further comprising:
 based on that the battery temperature of the battery module is higher than the critical temperature, measuring a system total current required for a load state of the load circuit through a power supply measurement block of the power supply circuit, and the power supply conversion block providing the power supply voltage having a limited power based on the system total current. 
 
     
     
       13. The power distribution method according to  claim 12 , further comprising:
 based on the system total current and a present current of an external power supply voltage of the adapter, determining a supply time of the battery voltage being converted into the power supply voltage. 
 
     
     
       14. The power distribution method according to  claim 13 , wherein determining the supply time of the battery voltage being converted into the power supply voltage comprises:
 determining a current of the power supply voltage based on the system total current and the present current of the external power supply voltage through the power supply control block; and 
 calculating a discharging time of the battery module discharging power from the critical power to a security power as the supply time according to the current of the power supply voltage. 
 
     
     
       15. The power distribution method according to  claim 14 , wherein the security power is less than the critical power. 
     
     
       16. The power distribution method according to  claim 13 , further comprising:
 during the supply time, based on that the battery temperature is lower than the critical temperature, stopping converting the battery voltage into the power supply voltage.